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HomeMy WebLinkAbout20211749 Ver 1_More Info Received_20211215From:tealleneng@comporium.net To:Yankura, Kaylie Cc:"Brown, David W CIV USARMY CESAW (USA)"; Leslie, Andrea J Subject:[External] RE: Stone Scour at Waterdance Bridge Abutments (DWR# 20211749); Request for Additional Information Date:Wednesday, December 15, 2021 3:44:48 PM Attachments:image001.png CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to Report Spam. Hello Mrs. Yankura: Please consider this email response as an addendum to the previously submitted PCN document for the subject project. 1. PCN Section 3. Project Description, 3d; …A temporary Armor Stone diversion structure shall be used to prevent the flowing stream from coming into contact with the disturbed area. Armor Stone shall be used to create a temporary diversion around the work area. Silt Curtains may be used in addition to the Armor Stone to control turbidity. Where Silt Curtains are used, the curtains shall be placed immediately behind (i.e., on the work side) and parallel to the Armor Stone diversion…. 2. PCN Section 4. Open Water Impacts, 4g; …A temporary Armor Stone diversion structure shall be used to prevent the flowing stream from coming into contact with the disturbed area. Armor Stone shall be used to create a temporary diversion around the work area. Silt Curtains may be used in addition to the Armor Stone to control turbidity. Where Silt Curtains are used, the curtains shall be placed immediately behind (i.e., on the work side) and parallel to the Armor Stone diversion…. 3. The Total Impact is 80 Linear Feet. Please call or email if you have any questions or if you require any additional information. Thank you. Terry Allen, PE, MSE T.E. ALLEN ENGINEERING, PC P.O. Box 103 Rosman, NC 28772 828-877-4883 Office 828-553-3004 Mobile From: Yankura, Kaylie [mailto:kaylie.yankura@ncdenr.gov] Sent: Wednesday, December 15, 2021 3:06 PM To: tealleneng@comporium.net Cc: Brown, David W CIV USARMY CESAW (USA); Leslie, Andrea J Subject: Stone Scour at Waterdance Bridge Abutments (DWR# 20211749); Request for Additional Information Terry Allen, On December 1, 2021, the Division of Water Resources (Division) received your application requesting a 401 Water Quality Certification from the Division for the subject project. The Division has determined that your application is incomplete and cannot be processed. The application is on hold until the following items are addressed: 1. Condition II.9 of General Water Quality Certification 4132 (GC 4132) states: “All work in or adjacent to streams shall be conducted so that the flowing stream does not come in contact with the disturbed area. Approved best management practices from the most current version of the NC Sediment and Erosion Control Manual, or the NC DOT Construction and Maintenance Activities Manual, such as sandbags, rock berms, cofferdams, and other diversion structures shall be used to minimize excavation in flowing water. Exceptions to this condition require application to and written approval from DWR.” Section 3. Project Description, 3d. of the submitted PCN states: “The work will be performed in the dry using silt curtains to isolate the work area and control turbidity.” Section 4. Open Water Impacts, 4g. of the submitted PCN states: “At the contractor’s option, the work may be accomplished in the dry by installing a temporary coffer dam around the proposed work area” with the use of three rows of turbidity curtains. It is also stated that “where the work is performed in the wet silt curtains shall be used to isolate the work area and control turbidity.” While silt curtains may reduce turbidity during project activities, their use alone does not satisfy Condition II.9 of GC 4132. Furthermore, the use of silt curtains per Sheet C-5 of the application may not be practicable at this location. Please indicate how the proposed work shall be conducted so that the flowing stream does not come into contact with the disturbed area. The proposed coffer dam is one option. Another option may include the use of armor stone associated with the proposed scour apron to create a temporary diversion around the work area. [15A NCAC 02H .0506(b)(1)] [15A NCAC 02H .0502(c)] 2. Please provide impact totals in linear feet, instead of area. [15A NCAC 02H .0506(b)(1)] [15A NCAC 02H .0502(c)] Pursuant to Title 15A NCAC 02H .0502(c), the applicant shall furnish all of the above requested information for the proper consideration of the application. If all of the requested information is not received, the Division will be unable to approve the application and it will be returned. Please contact me if you have any questions. You may provide your response via email or mail to the address below. Thank you, Kaylie Yankura Environmental Specialist – Asheville Regional Office Water Quality Regional Operations Section NCDEQ – Division of Water Resources 2090 U.S. Hwy. 70 Swannanoa, N.C. 28778 828 296 4685 office 828 231 9634 mobile kaylie.yankura@ncdenr.gov Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties Based on the current guidance to minimize the spread of COVID-19, the Department of Environmental Quality has adjusted operations to protect the health and safety of the staff and public. Many employees are working remotely or are on staggered shifts. To accommodate these staffing changes, all DEQ office locations are limiting public access to appointments only. Please check with the appropriate staff before visiting our offices, as we may be able to handle your requests by phone or email. We appreciate your patience as we continue to serve the public during this challenging time. 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